[3] He made his league debut in April 2017, coming on as a 90th minute substitute for Saku Ylätupa in a 3–1 victory over PS Kemi.
[4] In early 2017, it was announced that Hannola would be joining Danish Superliga side FC Midtjylland in the summer.
[5][6][7] He signed a new three year deal with FC Midtjylland in June 2018, and was assigned to the club's academy squad.
[8] After playing the 2021 season for SJK Seinäjoki on loan from HJK Helsinki, on 5 April 2022 Hannola returned to the club on a permanent basis with a long-term contract, for an undisclosed fee, reported to be €80,000.
[10] On 5 January 2025, Hannola joined Ekstraklasa club Stal Mielec on loan for the remainder of the season with an option to buy.